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 (
    457810, 457811, 457820, 458376, 458384, 
    458400, 458405, 459110, 459116, 459118, 
    459122, 459131, 459132, 459133, 459141, 
    459156, 459666, 459670, 459675, 459697, 
    459700, 459716, 459718, 459722
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "19.84"
    },
    "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": "17.44",
        "eval_cost": "2.40",
        "prefix_cost": "19.84",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (457810,457811,457820,458376,458384,458400,458405,459110,459116,459118,459122,459131,459132,459133,459141,459156,459666,459670,459675,459697,459700,459716,459718,459722)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}