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 (
    24521, 24522, 24523, 24524, 24525, 24526, 
    24527, 24528, 24529, 24530, 24531, 
    24532, 24533, 24534, 24535, 24536
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.01043

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 (24521,24522,24523,24524,24525,24526,24527,24528,24529,24530,24531,24532,24533,24534,24535,24536) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
24521 Tube-connector to rear, right<p>Part number 58736DS000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24522 Clip-Brake Fluid Line<p>Part number 58752D3250</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24523 Clip-Brake Fluid Line<p>Part number 58752D3030</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24524 Battery & Plug Assy<p>Part number 37100DS620</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24525 Battery-Built-in Cam<p>Part number 37120DS220</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24526 Clamp-Battery<p>Part number 37160DS000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24527 Sensor Assembly-Battery<p>Part number 37180DS000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24528 BOLT<p>Part number 1130208306B</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24529 BOLT<p>Part number 1141306147C</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24530 BOLT<p>Part number 1141306257C</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24531 pressure regulator<p>Part number 366850E050</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24532 battery system assembly<p>Part number 37501DS050</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24533 Relay Assembly - Power<p>Part number 37514DS000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24534 Bus Bar-Positive<p>Part number 37515CU000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24535 Bus Bar-Positive<p>Part number 37515CU010</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
24536 Bus Bar-Positive<p>Part number 37515DS020</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>