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 (
    51194, 51193, 51192, 51191, 51190, 51189, 
    19, 111, 51212, 144, 51215, 51214, 51213, 
    51444, 51445, 51446, 51447, 51220, 
    51219, 51218, 51217, 51216, 146, 51448, 
    51449, 9, 59, 60, 13, 51347, 85, 61, 51350, 
    123, 15, 95
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00085

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "25.21"
    },
    "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": 36,
      "rows_produced_per_join": 36,
      "filtered": "100.00",
      "index_condition": "((`test_uchur_k`.`cscart_product_descriptions`.`product_id` in (51194,51193,51192,51191,51190,51189,19,111,51212,144,51215,51214,51213,51444,51445,51446,51447,51220,51219,51218,51217,51216,146,51448,51449,9,59,60,13,51347,85,61,51350,123,15,95)) and (`test_uchur_k`.`cscart_product_descriptions`.`lang_code` = 'ru'))",
      "cost_info": {
        "read_cost": "21.61",
        "eval_cost": "3.60",
        "prefix_cost": "25.21",
        "data_read_per_join": "164K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}