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 (
    130681, 145323, 114897, 131992, 165403, 
    257589, 115093, 108241, 197488, 175093, 
    165284, 156319, 202170, 167561, 108245, 
    139394, 159546, 156799, 211705, 252518, 
    108234, 164905, 108385, 112103, 129512, 
    161993, 112102, 129527, 144425, 131847, 
    108248, 120905, 108242, 242304, 111949, 
    196622, 111951, 133995, 128503, 131987, 
    156326, 114827, 132626, 135126, 138125, 
    161899, 114282, 174366
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.02247

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "40.58"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "35.78",
        "eval_cost": "4.80",
        "prefix_cost": "40.58",
        "data_read_per_join": "244K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (130681,145323,114897,131992,165403,257589,115093,108241,197488,175093,165284,156319,202170,167561,108245,139394,159546,156799,211705,252518,108234,164905,108385,112103,129512,161993,112102,129527,144425,131847,108248,120905,108242,242304,111949,196622,111951,133995,128503,131987,156326,114827,132626,135126,138125,161899,114282,174366)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}