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 (
    25287, 25288, 25289, 25290, 25291, 25292, 
    25293, 25294, 25295, 25296, 25297, 
    25298, 25299, 25300, 25301, 25302
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00154

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 (25287,25288,25289,25290,25291,25292,25293,25294,25295,25296,25297,25298,25299,25300,25301,25302) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
25287 BOLT<p>Part number 1140306166P</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25288 BOLT-FLANGE<p>Part number 1146006186K</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25289 BOLT-FLANGE<p>Part number 1142506187P</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25290 Plug-Rubber<p>Part number 375T5K4000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25291 battery system assembly<p>Part number 37501CU160</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25292 Relay Assembly - Power<p>Part number 37514CU000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25293 Bus Bar-Positive<p>Part number 37515CU120</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25294 Bus Bar - Negative<p>Part number 37516CU120</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25295 Cap-Battery Terminal<p>Part number 37529GI040</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25296 Bolt & Washer Assembly<p>Part number 37535GI040</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25297 Bolt & Washer Assembly<p>Part number 37535GI140</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25298 Connector Assembly - High Voltage<p>Part number 37537GI070</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25299 Cover Assembly-Battery<p>Part number 37565GI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25300 Panel assembly - high voltage cover, back<p>Part number 37599GI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25301 Battery management unit<p>Part number 375A0CU060</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
25302 Wiring Harness-UART Communications<p>Part number 375C1KL000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>