SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    21567, 51083, 22715, 51082, 51085, 51081, 
    51096, 51097, 51098, 51100, 51099, 
    22716, 51123, 51122, 51121, 92, 49, 
    51129, 51128, 51127, 51126, 51125, 
    48, 51176, 51174, 51173, 51172, 91, 
    51221, 137, 51224, 51223, 126, 51343, 
    51342, 51341, 51340, 47, 105, 50989, 
    31, 51366, 51367, 51368, 51369, 46, 
    51370, 51371, 51372, 51373, 51452, 
    51453, 88, 51395, 51396, 51397, 51555, 
    51556, 51496
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "41.31"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 59,
      "rows_produced_per_join": 59,
      "filtered": "100.00",
      "index_condition": "((`test_uchur_k`.`cscart_product_descriptions`.`product_id` in (21567,51083,22715,51082,51085,51081,51096,51097,51098,51100,51099,22716,51123,51122,51121,92,49,51129,51128,51127,51126,51125,48,51176,51174,51173,51172,91,51221,137,51224,51223,126,51343,51342,51341,51340,47,105,50989,31,51366,51367,51368,51369,46,51370,51371,51372,51373,51452,51453,88,51395,51396,51397,51555,51556,51496)) and (`test_uchur_k`.`cscart_product_descriptions`.`lang_code` = 'ru'))",
      "cost_info": {
        "read_cost": "35.41",
        "eval_cost": "5.90",
        "prefix_cost": "41.31",
        "data_read_per_join": "269K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}