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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    85212, 85258, 85120, 87310, 87311, 87322, 
    87323, 87334, 87335, 87346, 87347, 
    86144, 86145, 86167, 86168, 86660, 
    86661, 86729, 86730, 87298, 87299, 
    83070, 83623, 90906, 90985, 85081, 
    85167, 85213, 85259, 86142, 86165, 
    86658, 86727, 85854, 85855, 85864, 
    85865, 85121, 89077, 85317, 85318, 
    85414, 85415, 85465, 85466, 85516, 
    85517, 82852
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (85212,85258,85120,87310,87311,87322,87323,87334,87335,87346,87347,86144,86145,86167,86168,86660,86661,86729,86730,87298,87299,83070,83623,90906,90985,85081,85167,85213,85259,86142,86165,86658,86727,85854,85855,85864,85865,85121,89077,85317,85318,85414,85415,85465,85466,85516,85517,82852)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}