SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    51480, 51479, 132, 3, 2, 66, 133, 51471, 
    51459, 51470, 51472, 51529, 51460, 
    51457, 51464, 51501, 51486, 51478, 
    51469, 51461, 51467, 51473, 51477, 
    51475, 51462, 51463, 51516, 51532, 
    51458, 51514, 51468, 51476, 51491, 
    51492, 51513, 51474, 51515, 51502, 
    51518, 51466, 51512, 51465, 51482, 
    51485, 51511, 51528, 51527, 51505, 
    51493, 51535
  ) 
  AND cscart_product_descriptions.lang_code = 'kk'

Query time 0.00123

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "35.01"
    },
    "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": 50,
      "rows_produced_per_join": 50,
      "filtered": "100.00",
      "index_condition": "((`test_uchur_k`.`cscart_product_descriptions`.`product_id` in (51480,51479,132,3,2,66,133,51471,51459,51470,51472,51529,51460,51457,51464,51501,51486,51478,51469,51461,51467,51473,51477,51475,51462,51463,51516,51532,51458,51514,51468,51476,51491,51492,51513,51474,51515,51502,51518,51466,51512,51465,51482,51485,51511,51528,51527,51505,51493,51535)) and (`test_uchur_k`.`cscart_product_descriptions`.`lang_code` = 'kk'))",
      "cost_info": {
        "read_cost": "30.01",
        "eval_cost": "5.00",
        "prefix_cost": "35.01",
        "data_read_per_join": "228K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "meta_keywords",
        "meta_description",
        "search_words",
        "promo_text",
        "unit_name"
      ]
    }
  }
}