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 (
    476264, 476266, 476273, 476276, 476277, 
    476316, 477586, 477597, 477615, 477619, 
    477630, 478158, 478164, 478177, 478906, 
    478950, 478956, 479463, 479491, 479495, 
    479522, 480230, 480285, 480795
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "20.16"
    },
    "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": "17.76",
        "eval_cost": "2.40",
        "prefix_cost": "20.16",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (476264,476266,476273,476276,476277,476316,477586,477597,477615,477619,477630,478158,478164,478177,478906,478950,478956,479463,479491,479495,479522,480230,480285,480795)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}