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 (
    51289, 51288, 51287, 51286, 51285, 51284, 
    51283, 8, 51294, 51293, 51291, 51290, 
    94, 142, 62, 141, 27, 22, 23, 18, 86, 51344, 
    120, 51345, 119, 108, 4, 107, 51348, 
    121
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.01"
    },
    "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": 30,
      "rows_produced_per_join": 30,
      "filtered": "100.00",
      "index_condition": "((`test_uchur_k`.`cscart_product_descriptions`.`product_id` in (51289,51288,51287,51286,51285,51284,51283,8,51294,51293,51291,51290,94,142,62,141,27,22,23,18,86,51344,120,51345,119,108,4,107,51348,121)) and (`test_uchur_k`.`cscart_product_descriptions`.`lang_code` = 'ru'))",
      "cost_info": {
        "read_cost": "18.01",
        "eval_cost": "3.00",
        "prefix_cost": "21.01",
        "data_read_per_join": "136K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text"
      ]
    }
  }
}