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 (
    10481, 10492, 10494, 10495, 10496, 10497, 
    10498, 10499, 10505, 10506, 10507, 
    10516, 10517, 10522, 10523, 10524
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00047

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 (10481,10492,10494,10495,10496,10497,10498,10499,10505,10506,10507,10516,10517,10522,10523,10524) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description unit_name
10481 cap front hook<p>Part number 86517T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10492 Label - Caution<p>Part number 25388T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10494 Ultrasonic Sensor Assembly-Parking Assist System<p>Part number 99310L1100EB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10495 Ultrasonic Sensor Assembly-Parking Assist System<p>Part number 99350T1000MDY</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10496 screw-machine<p>Part number 1221006203</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10497 nut-spring<p>Part number 86679B1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10498 nut-spring<p>Part number 1334106007B</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10499 Cover - Rear Bumper<p>Part number 86650T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10505 Beam-rear bumper<p>Part number 86631T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10506 Pad-Rubber Bumper<p>Part number 86622T1010</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10507 Pad-Rubber Bumper<p>Part number 86629T1010</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10516 Cap-rear hook<p>Part number 86617T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10517 Pad-sealing<p>Part number 86629T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10522 Lamp assembly - rear reflex reflector, left<p>Part number 92405T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10523 Lamp assembly - rear reflex reflector, right<p>Part number 92406T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10524 Ultrasonic Sensor Assembly-Parking Assist System<p>Part number 99310L1000MDY</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>