SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    148, 180, 18, 16, 4, 5, 23, 24, 1, 22, 149, 
    190, 189, 245, 238, 239, 242, 243, 59, 
    58, 60, 172, 134, 135, 168, 167, 169, 
    42, 39, 40, 37, 74, 73, 71, 75, 72, 70, 
    156, 175, 43, 76, 56, 57, 30, 246, 173, 
    67, 25, 154, 53, 52, 161, 165, 166, 86, 
    106, 105, 101, 33, 32, 163, 155, 55, 69, 
    184, 183, 133, 132, 125, 120, 146, 147, 
    117, 113, 157, 68, 29, 6, 8, 14, 9, 10, 
    19, 21, 50, 51, 49, 48, 54, 153, 164, 248, 
    65, 64, 63, 62
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "230.41"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "index_condition": "((`danishecarter_31jan`.`cscart_product_descriptions`.`product_id` in (148,180,18,16,4,5,23,24,1,22,149,190,189,245,238,239,242,243,59,58,60,172,134,135,168,167,169,42,39,40,37,74,73,71,75,72,70,156,175,43,76,56,57,30,246,173,67,25,154,53,52,161,165,166,86,106,105,101,33,32,163,155,55,69,184,183,133,132,125,120,146,147,117,113,157,68,29,6,8,14,9,10,19,21,50,51,49,48,54,153,164,248,65,64,63,62)) and (`danishecarter_31jan`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "211.21",
        "eval_cost": "19.20",
        "prefix_cost": "230.41",
        "data_read_per_join": "438K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}