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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 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 
  products.timestamp desc, 
  products.product_id ASC 
LIMIT 
  160, 32

Query time 0.00847

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "106.79"
    },
    "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": 6,
              "filtered": "4.00",
              "using_join_buffer": "Block Nested Loop",
              "cost_info": {
                "read_cost": "36.94",
                "eval_cost": "1.33",
                "prefix_cost": "40.75",
                "data_read_per_join": "17K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "(((`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": 33,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "7.36",
                "eval_cost": "6.64",
                "prefix_cost": "54.74",
                "data_read_per_join": "531"
              },
              "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": 3,
              "filtered": "9.56",
              "cost_info": {
                "read_cost": "33.20",
                "eval_cost": "0.63",
                "prefix_cost": "94.58",
                "data_read_per_join": "14K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "timestamp",
                "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": 3,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "3.17",
                "eval_cost": "0.63",
                "prefix_cost": "98.39",
                "data_read_per_join": "12K"
              },
              "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": 3,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "3.17",
                "eval_cost": "0.63",
                "prefix_cost": "102.20",
                "data_read_per_join": "14K"
              },
              "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": 6,
              "filtered": "96.85",
              "using_index": true,
              "cost_info": {
                "read_cost": "3.32",
                "eval_cost": "1.23",
                "prefix_cost": "106.79",
                "data_read_per_join": "147"
              },
              "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
180	18-55mm Portrait Lens	CS-Cart	P
181	Women's Bloom Complete Set	CS-Cart	P
182	GBC® Smart-View® 3-Ring Report Cover	CS-Cart	P
183	Samsung 50-200mm NX Telephoto OIS Lens	CS-Cart	P
184	Samsung 30mm NX Pancake Lens	CS-Cart	P
185	CG Lightweight Cart Bag	CS-Cart	P
186	CG Black Staff Bag	CS-Cart	P
187	2010 TOUR STAFF Bag 10"	CS-Cart	P
188	NEW Wilson Staff Fifty Elite Yellow Golf Ball	CS-Cart	P
189	AF-S NIKKOR 14-24mm f/2.8G ED	CS-Cart	P
190	AF-S DX NIKKOR 10-24mm f/3.5-4.5G ED	CS-Cart	P
191	Esperanza Spalding - Radio Music Society	CS-Cart	P
1	65" Class (64.5" Diag.) LED 8000 Series Smart TV	CS-Cart	P
5	46" Class (45.9" Diag.) LCD 610 Series TV	CS-Cart	P
7	Trefoil Hoodie	CS-Cart	P
8	Toshiba 32TL515U 32" Class 1080P 3D LED HD TV	CS-Cart	P
9	Toshiba 42TL515U 42" Class 1080P 3D LED HD TV	CS-Cart	P
10	Toshiba 47TL515U 47" Class 1080P 3D LED HD TV	CS-Cart	P
11	Collegiate 72 Tee	CS-Cart	P
12	100g Pants	CS-Cart	P
13	Your Idea, Inc. 12 Steps to Building a Million Dollar Business -- Starting Today!	CS-Cart	P
14	Toshiba 40E220U 40" Class 1080P HD LCD TV	CS-Cart	P
15	Nike Chambray Super Runner Men's Jacket	CS-Cart	P
16	3D Blu-ray Disc™ Player (BD-D7500)	CS-Cart	P
17	101 Things Everyone Should Know About Economics A Down and Dirty Guide to Everything from Securities and Derivatives to Interest Rates and Hedge Funds—And What They Mean For You	CS-Cart	P
18	3D Blu-ray Disc™ Player (BD-D7000)	CS-Cart	P
19	Toshiba BDX2150 Blu-ray Player	CS-Cart	P
20	The ABCs of Gold Investing. How to Protect and Build Your Wealth with Gold	CS-Cart	P
21	Toshiba SD3300 DVD Player	CS-Cart	P
22	7.1 Channel Blu-ray 3D Home Theater System	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