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SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  IF(
    shared_descr.product_id IS NOT NULL, 
    shared_descr.product, descr1.product
  ) as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ult_product_descriptions shared_descr ON shared_descr.product_id = products.product_id 
  AND shared_descr.company_id = 1 
  AND shared_descr.lang_code = 'en' 
WHERE 
  1 
  AND cscart_categories.category_id IN (
    166, 165, 167, 168, 169, 170, 171, 172, 
    174, 175, 176, 177, 178, 179, 180, 181, 
    182, 199, 185, 186, 187, 188, 189, 190, 
    191, 194, 193, 195, 196, 197, 198, 200, 
    201, 202, 234, 235, 236, 237, 238, 240, 
    254, 255, 263
  ) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 64

Query time 0.00484

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "57.86"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "companies",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 1,
              "filtered": "50.00",
              "cost_info": {
                "read_cost": "2.28",
                "eval_cost": "0.20",
                "prefix_cost": "2.48",
                "data_read_per_join": "5K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`rajansecarter_single_store_19_jan`.`companies`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "rows_examined_per_scan": 166,
              "rows_produced_per_join": 1,
              "filtered": "1.04",
              "using_join_buffer": "Block Nested Loop",
              "cost_info": {
                "read_cost": "37.93",
                "eval_cost": "0.34",
                "prefix_cost": "40.75",
                "data_read_per_join": "4K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "((`rajansecarter_single_store_19_jan`.`cscart_categories`.`category_id` in (166,165,167,168,169,170,171,172,174,175,176,177,178,179,180,181,182,199,185,186,187,188,189,190,191,194,193,195,196,197,198,200,201,202,234,235,236,237,238,240,254,255,263)) and ((`rajansecarter_single_store_19_jan`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`rajansecarter_single_store_19_jan`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`rajansecarter_single_store_19_jan`.`cscart_categories`.`usergroup_ids`)) and (`rajansecarter_single_store_19_jan`.`cscart_categories`.`status` in ('A','H')) and (`rajansecarter_single_store_19_jan`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "rajansecarter_single_store_19_jan.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 5,
              "rows_produced_per_join": 8,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "1.91",
                "eval_cost": "1.72",
                "prefix_cost": "44.38",
                "data_read_per_join": "137"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "rajansecarter_single_store_19_jan.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "9.56",
              "cost_info": {
                "read_cost": "8.60",
                "eval_cost": "0.16",
                "prefix_cost": "54.70",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "parent_product_id"
              ],
              "attached_condition": "((`rajansecarter_single_store_19_jan`.`products`.`company_id` = `rajansecarter_single_store_19_jan`.`companies`.`company_id`) and (`rajansecarter_single_store_19_jan`.`products`.`parent_product_id` = 0) and ((`rajansecarter_single_store_19_jan`.`products`.`usergroup_ids` = '') or find_in_set(0,`rajansecarter_single_store_19_jan`.`products`.`usergroup_ids`) or find_in_set(1,`rajansecarter_single_store_19_jan`.`products`.`usergroup_ids`)) and (`rajansecarter_single_store_19_jan`.`products`.`status` = 'A'))"
            }
          },
          {
            "table": {
              "table_name": "shared_descr",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id",
                "company_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code",
                "company_id"
              ],
              "key_length": "13",
              "ref": [
                "rajansecarter_single_store_19_jan.products_categories.product_id",
                "const",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.82",
                "eval_cost": "0.16",
                "prefix_cost": "55.68",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "company_id",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "rajansecarter_single_store_19_jan.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.82",
                "eval_cost": "0.16",
                "prefix_cost": "56.67",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "usergroup",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "rajansecarter_single_store_19_jan.products_categories.product_id"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 1,
              "filtered": "96.85",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.86",
                "eval_cost": "0.32",
                "prefix_cost": "57.86",
                "data_read_per_join": "38"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`rajansecarter_single_store_19_jan`.`prices`.`lower_limit` = 1) and (`rajansecarter_single_store_19_jan`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type
148	16GB A Series Walkman Video MP3	CS-Cart	P
180	18-55mm Portrait Lens	CS-Cart	P
18	3D Blu-ray Disc™ Player (BD-D7000)	CS-Cart	P
16	3D Blu-ray Disc™ Player (BD-D7500)	CS-Cart	P
4	40" Class (40.0" Diag.) LED 5003 Series TV	CS-Cart	P
5	46" Class (45.9" Diag.) LCD 610 Series TV	CS-Cart	P
23	5.1 Channel Blu-ray 3D Home Theater System	CS-Cart	P
24	5.1 Channel Blu-ray 3D Home Theater System	CS-Cart	P
1	65" Class (64.5" Diag.) LED 8000 Series Smart TV	CS-Cart	P
22	7.1 Channel Blu-ray 3D Home Theater System	CS-Cart	P
149	8GB E Series Walkman Video MP3	CS-Cart	P
227	Acer 3D Series HN274H bmiiid	CS-Cart	P
190	AF-S DX NIKKOR 10-24mm f/3.5-4.5G ED	CS-Cart	P
189	AF-S NIKKOR 14-24mm f/2.8G ED	CS-Cart	P
245	Apple - iPhone 5c 32GB Cell Phone - Green	CS-Cart	P
238	Apple iPhone 4S Black	CS-Cart	P
239	Apple iPhone 4S White	CS-Cart	P
242	Apple iPod Classic Black	CS-Cart	P
243	Apple iPod Classic White	CS-Cart	P
241	Apple® - iPad® with Retina® display Wi-Fi - 32GB - White	CS-Cart	P
240	Apple® - iPad® with Retina® display Wi-Fi - 64GB - Black	CS-Cart	P
214	ASUS CP6130	CS-Cart	P
217	ASUS CP6230	CS-Cart	P
218	ASUS Essentio CP1130	CS-Cart	P
207	Asus USB-N53	CS-Cart	P
59	AVH-P4400BH	CS-Cart	P
58	AVH-P8400BH	CS-Cart	P
60	AVIC-Z130BT	CS-Cart	P
172	Compact Full HD Camcorder	CS-Cart	P
134	Creative ZEN Style M300 MP3 Player 16GB (Black)	CS-Cart	P
135	Creative ZEN Touch 2 MP3 Player 8GB (Black)	CS-Cart	P
168	D300S (Body Only)	CS-Cart	P
167	D3100 + 18-55 VR Lens Kit	CS-Cart	P
169	D5100 + AF-S DX NIKKOR 18-55mm f/3.5-5.6G VR Lens Kit	CS-Cart	P
42	DEH-1300MP	CS-Cart	P
39	DEH-80PRS	CS-Cart	P
40	DEH-P8400BH	CS-Cart	P
205	DIR-657 HD Media Router 1000	CS-Cart	P
37	DPX308U	CS-Cart	P
74	Droid 3	CS-Cart	P
73	DROID BIONIC	CS-Cart	P
71	DROID INCREDIBLE 2	CS-Cart	P
75	DROID PRO	CS-Cart	P
72	DROID RAZR	CS-Cart	P
70	EVO Design 4G	CS-Cart	P
156	Extra Bass Headphones – 70mm	CS-Cart	P
175	F50 Flash Memory 52x Zoom Camcorder (Silver)	CS-Cart	P
43	FH-P8000BT	CS-Cart	P
76	FLIPSIDE with MOTOBLUR	CS-Cart	P
56	GM-6500F	CS-Cart	P
57	GM-D8500M	CS-Cart	P
30	GO 2535 TM WTE	CS-Cart	P
246	GoPro - Hero3+ Black Edition Camera	CS-Cart	P
208	H.264 Megapixel Surveillance Camera TL-SC3430	CS-Cart	P
173	H300 Long Zoom Compact Full HD Camcorder (Black)	CS-Cart	P
229	HP 2711x 27" LED Monitor	CS-Cart	P
211	HP Officejet Pro 8600 Premium e-All-in-One Printer	CS-Cart	P
210	HP Photosmart Plus e-All-in-One Printer - B210a	CS-Cart	P
209	HP Scanjet G3110 Scanner	CS-Cart	P
67	HTC Wildfire S - White (T-Mobile)	CS-Cart	P
25	HW-D7000 AV Receiver with built-in Blu-ray Disc® Player	CS-Cart	P
213	Intel® Boxed Intel® Core™ i7-2600	CS-Cart	P
215	Intel® Core™ i7 processor Extreme Edition 980X – i7-980X	CS-Cart	P
226	Intel® Core™ i7 Processor i7-950	CS-Cart	P