SELECT 
  product_descriptions.product_id, 
  product_descriptions.short_description, 
  IF(
    product_descriptions.short_description = '' 
    OR product_descriptions.short_description IS NULL, 
    product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  product_descriptions 
WHERE 
  product_descriptions.product_id IN (
    335017, 335040, 335041, 335593, 335625, 
    336339, 336361, 336369, 336375, 336396, 
    336901, 336930, 336954, 337674, 337682, 
    337716, 338216, 338233, 338234, 338237, 
    338241, 338251, 338252, 338257
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00180

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "20.32"
    },
    "table": {
      "table_name": "product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "11",
      "rows_examined_per_scan": 24,
      "rows_produced_per_join": 24,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "17.92",
        "eval_cost": "2.40",
        "prefix_cost": "20.32",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (335017,335040,335041,335593,335625,336339,336361,336369,336375,336396,336901,336930,336954,337674,337682,337716,338216,338233,338234,338237,338241,338251,338252,338257)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}