SELECT 
  lang.name, 
  IF(
    cscart_ult_language_values.value IS NULL, 
    lang.value, cscart_ult_language_values.value
  ) as value 
FROM 
  cscart_language_values lang 
  LEFT JOIN cscart_ult_language_values ON cscart_ult_language_values.name = lang.name 
  AND company_id = 1 
  AND cscart_ult_language_values.lang_code = lang.lang_code 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'quick_view', 'gift_certificate', 
    'free_products', 'quick_view', 'gift_certificate', 
    'edit', 'gift_certificate', 'gift_cert_to', 
    'gift_cert_from', 'amount', 'send_via', 
    'postal_mail', 'free_products', 
    'product', 'price', 'quantity', 'subtotal', 
    'price_summary', 'quick_view', 'gift_certificate', 
    'free_products', 'quick_view', 'gift_certificate', 
    'edit', 'gift_certificate', 'gift_cert_to', 
    'gift_cert_from', 'amount', 'send_via', 
    'postal_mail', 'free_products', 
    'product', 'price', 'quantity', 'subtotal', 
    'price_summary'
  )

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "33.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_ult_language_values",
          "access_type": "system",
          "possible_keys": [
            "PRIMARY"
          ],
          "rows_examined_per_scan": 0,
          "rows_produced_per_join": 1,
          "filtered": "0.00",
          "const_row_not_found": true,
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.20",
            "prefix_cost": "0.00",
            "data_read_per_join": "408"
          },
          "used_columns": [
            "lang_code",
            "name",
            "value",
            "company_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "lang_code",
            "name"
          ],
          "key_length": "392",
          "rows_examined_per_scan": 14,
          "rows_produced_per_join": 14,
          "filtered": "100.00",
          "index_condition": "((`rajansecarter_single_store_19_jan`.`lang`.`lang_code` = 'en') and (`rajansecarter_single_store_19_jan`.`lang`.`name` in ('quick_view','gift_certificate','free_products','quick_view','gift_certificate','edit','gift_certificate','gift_cert_to','gift_cert_from','amount','send_via','postal_mail','free_products','product','price','quantity','subtotal','price_summary','quick_view','gift_certificate','free_products','quick_view','gift_certificate','edit','gift_certificate','gift_cert_to','gift_cert_from','amount','send_via','postal_mail','free_products','product','price','quantity','subtotal','price_summary')))",
          "cost_info": {
            "read_cost": "30.81",
            "eval_cost": "2.80",
            "prefix_cost": "33.61",
            "data_read_per_join": "5K"
          },
          "used_columns": [
            "lang_code",
            "name",
            "value"
          ]
        }
      }
    ]
  }
}