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 (
    94733, 94734, 94737, 94738, 94741, 94742, 
    94745, 94746, 94749, 96304, 96308, 
    96310, 96311, 96313, 96314, 96316, 
    96318, 96319, 96321, 96323, 96325, 
    96327, 96329, 96331, 96333, 96337, 
    97015, 97017, 97024, 97027, 97028, 
    97029, 97031, 97033, 97040, 97046, 
    97841, 97844, 97845, 97848, 97849, 
    97850, 97853, 97854, 97857, 97858, 
    97861, 97862
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00062

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 (94733,94734,94737,94738,94741,94742,94745,94746,94749,96304,96308,96310,96311,96313,96314,96316,96318,96319,96321,96323,96325,96327,96329,96331,96333,96337,97015,97017,97024,97027,97028,97029,97031,97033,97040,97046,97841,97844,97845,97848,97849,97850,97853,97854,97857,97858,97861,97862)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}