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 (
    23711, 23712, 23713, 23714, 23715, 23716, 
    23717, 23718, 23719, 23720, 23721, 
    23722, 23723, 23724, 23725, 23726
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00035

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 (23711,23712,23713,23714,23715,23716,23717,23718,23719,23720,23721,23722,23723,23724,23725,23726) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
23711 Case-right<p>Part number 971A8AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23712 Sensor Assembly-Fine Dust<p>Part number 97253AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23713 Cover Assay-Under<p>Part number 97285AR000NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23714 Hose assembly - water inlet<p>Part number 97311AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23715 Hose Assembly - Water Outlet<p>Part number 97312AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23716 Duct - rear heating, left<p>Part number 97360AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23717 Duct-rear heating rear, left<p>Part number 97365AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23718 Duct-rear heating rear, right<p>Part number 97375AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23719 Duct - rear heating, right<p>Part number 97370AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23720 Grille assembly - air extractor, right<p>Part number 97535AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23721 Grille Assembly - Air Extractor<p>Part number 97525AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23722 Sensor assembly-fingerprint recognition module<p>Part number 955C0AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23723 Control Assembly - Heater<p>Part number 97250AR053UV2</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23724 control assembly<p>Part number 97255AR011</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23725 compressor assembly<p>Part number 97701AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
23726 Hose-Discharge<p>Part number 97762AR000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>