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 (
    22015, 22016, 22017, 22018, 22019, 22020, 
    22021, 22022, 22023, 22024, 22025, 
    22026, 22027, 22028, 22029, 22030
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "idx_product_lang"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (22015,22016,22017,22018,22019,22020,22021,22022,22023,22024,22025,22026,22027,22028,22029,22030) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
22015 BOLT<p>Part number 55145C5000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22016 bolt-cam<p>Part number 552603R000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22017 plate<p>Part number 55223D2000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22018 WHEEL ASSY-STEERING<p>Part number 56100T6831SR1</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22019 Module assembly - steering wheel airbag<p>Part number 80100T6100VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22020 Brake Assembly-Front.Left<p>Part number 58110T6310BRC</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22021 Brake assembly - front, right<p>Part number 58130T6310BRC</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22022 Pad Kit - Front Disc Brake<p>Part number 58101T6A30</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22023 Cover-Dust back, right<p>Part number 58245T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22024 Cover-Dust back, left<p>Part number 58243T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22025 reservoir assembly<p>Part number 58511T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22026 BOLT<p>Part number 1123308166K</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22027 Tube-Hydraulic Module to Connector Left<p>Part number 58712T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22028 Tube-Hydraulic Module to Connector Right<p>Part number 58713T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22029 Tube-Hydralic Module to Connector<p>Part number 58714T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
22030 connector<p>Part number 58724T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>