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 (
    51076, 51073, 51072, 51074, 51075, 22711, 
    22710, 51077, 51080, 51078, 51079, 
    51139, 51138, 51137, 51136, 51135, 
    40, 51144, 51143, 51142, 51141, 51140, 
    39, 51205, 51204, 51203, 51202, 125, 
    27, 22, 17, 18, 106, 58, 57, 5, 51349, 
    122, 65
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "27.31"
    },
    "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": 39,
      "rows_produced_per_join": 39,
      "filtered": "100.00",
      "index_condition": "((`test_uchur_k`.`cscart_product_descriptions`.`product_id` in (51076,51073,51072,51074,51075,22711,22710,51077,51080,51078,51079,51139,51138,51137,51136,51135,40,51144,51143,51142,51141,51140,39,51205,51204,51203,51202,125,27,22,17,18,106,58,57,5,51349,122,65)) and (`test_uchur_k`.`cscart_product_descriptions`.`lang_code` = 'ru'))",
      "cost_info": {
        "read_cost": "23.41",
        "eval_cost": "3.90",
        "prefix_cost": "27.31",
        "data_read_per_join": "177K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}