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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    98479, 98480, 98481, 98483, 98484, 98485, 
    98486, 98487, 98488, 98489, 98490, 
    98491, 98492, 98493, 98494, 98495, 
    98503, 98504, 98505, 98506, 98507, 
    98508, 98550, 98551, 98560, 98561, 
    98562, 98570, 98571, 98683, 98684, 
    98685, 98686, 98716, 98717, 98718, 
    98719, 98720, 98721, 98722, 98723, 
    98724, 98725, 98726, 98727, 98728, 
    98729, 98730
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00144

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (98479,98480,98481,98483,98484,98485,98486,98487,98488,98489,98490,98491,98492,98493,98494,98495,98503,98504,98505,98506,98507,98508,98550,98551,98560,98561,98562,98570,98571,98683,98684,98685,98686,98716,98717,98718,98719,98720,98721,98722,98723,98724,98725,98726,98727,98728,98729,98730)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}