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 (
    10766, 10767, 10768, 10776, 10781, 10789, 
    10791, 10792, 10793, 10796, 10797, 
    10801, 10806, 10807, 10812, 10815
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00040

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 (10766,10767,10768,10776,10781,10789,10791,10792,10793,10796,10797,10801,10806,10807,10812,10815) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
10766 Nut-Flange<p>Part number 1338506007B</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10767 Key-Blanking PIC<p>Part number 81996T6000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10768 Unit Assembly - Head Up Display<p>Part number 94310T1600</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10776 FOB-Smart Key<p>Part number 95440T1210</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10781 Camera assembly - video recording system front view<p>Part number 95760T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10789 Unit assembly - front corner radar, left<p>Part number 99120JI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10791 Unit assembly - front corner radar, right<p>Part number 99130JI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10792 Unit assembly - rear corner radar, left<p>Part number 99140JI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10793 Unit assembly - rear corner radar, right<p>Part number 99150JI000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10796 Unit assembly - driver assistance driving controller<p>Part number 99810T1100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10797 Unit assembly - driver assistance parking controller<p>Part number 99910T1050</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10801 BOLT<p>Part number 1141506143</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10806 Amplifier assembly - glass antenna (RADIO)<p>Part number 96270T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10807 Coil & Capacitor<p>Part number 96295T1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10812 External amplifier assembly<p>Part number 96370T1600</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
10815 BOLT<p>Part number 1144206206B</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>