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 (
    85960, 89532, 90235, 90240, 89540, 82492, 
    90225, 90183, 90234, 90239, 87371, 
    90224, 90199, 89546, 89538, 90173, 
    90308, 89554, 90223, 90278, 90286, 
    91481, 90198, 85620, 85634, 91480, 
    89544, 85618, 89542, 85616, 85619, 
    85633, 90222, 82491, 89563, 90221, 
    90197, 85617, 82490, 85615, 90205, 
    90216, 90220, 82489, 90191, 90277, 
    91478, 91885
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "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 (85960,89532,90235,90240,89540,82492,90225,90183,90234,90239,87371,90224,90199,89546,89538,90173,90308,89554,90223,90278,90286,91481,90198,85620,85634,91480,89544,85618,89542,85616,85619,85633,90222,82491,89563,90221,90197,85617,82490,85615,90205,90216,90220,82489,90191,90277,91478,91885)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}