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 (
    377817, 379144, 379186, 379905, 380474, 
    380489, 380516, 381251, 381274, 381809, 
    381812, 381832, 382569, 383106, 383107, 
    383137, 383875, 383893, 384435, 384452, 
    384464, 384466, 385196, 385200
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00209

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "19.72"
    },
    "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": "17.32",
        "eval_cost": "2.40",
        "prefix_cost": "19.72",
        "data_read_per_join": "122K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (377817,379144,379186,379905,380474,380489,380516,381251,381274,381809,381812,381832,382569,383106,383107,383137,383875,383893,384435,384452,384464,384466,385196,385200)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}