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 (
    25255, 25256, 25257, 25258, 25259, 25260, 
    25261, 25262, 25263, 25264, 25265, 
    25266, 25267, 25268, 25269, 25270
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00103

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 (25255,25256,25257,25258,25259,25260,25261,25262,25263,25264,25265,25266,25267,25268,25269,25270) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
25255 Cover-motor sound iso option, front<p>Part number 365411XAA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25256 Cover-motor sound iso option, front<p>Part number 365411XCB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25257 Cover-motor sound iso option, rear<p>Part number 365421XAA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25258 Cover-motor sound iso option, rear<p>Part number 365421XCB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25259 Cover-motor sound iso option, rear<p>Part number 365441XAA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25260 Cover-motor sound option, lower<p>Part number 365461XCB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25261 Resolver assembly<p>Part number 365691XAA1</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25262 Tube assembly - feed<p>Part number 365631XAB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25263 Tube assembly - feed<p>Part number 365631XAA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25264 Tube assembly - feed<p>Part number 365641XCB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25265 sensor connector<p>Part number 365653D950</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25266 Stator Assembly-Resolver<p>Part number 365691XAB0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25267 Cover-motor side sound isolation option<p>Part number 365431XAA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25268 Cover-reducer housing sound isolation option<p>Part number 3654318FA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25269 Tube Compress-Center<p>Part number 366901XCA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25270 Tube assembly - center, 1<p>Part number 366T11XCA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>