SELECT 
  a.attachment_id as 'attachment_id', 
  filename, 
  filesize, 
  category, 
  last_updated, 
  d.description as 'description' 
FROM 
  cscart_attachments as a 
  LEFT JOIN cscart_attachment_descriptions as d ON a.attachment_id = d.attachment_id 
WHERE 
  object_id = 61467 
  AND status = 'A' 
ORDER BY 
  d.description ASC

Query time 0.00220

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "d.description",
      "temporary_table": {
        "table": {
          "table_name": "a",
          "access_type": "ALL",
          "rows": 6837,
          "filtered": 100,
          "attached_condition": "a.object_id = 61467 and a.`status` = 'A'"
        },
        "table": {
          "table_name": "d",
          "access_type": "ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["attachment_id"],
          "ref": ["cscart_migrate.a.attachment_id"],
          "rows": 1,
          "filtered": 100
        }
      }
    }
  }
}

Result

attachment_id filename filesize category last_updated description
19532 MKT-0025_-_Barn_Light_Electric_Finishes_-_REV_B.pdf 2418240 4 1604691684 Barn Light Electric Finishes
9260 MKT-0021_-_Optional_Accessories_-_REV_F.pdf 11539937 4 1681915272 Optional Accessories
14649 INS-0002_-_Stem_Mount_Pendant_-_Rev_V.pdf 133942 7 1568751304 Stem Mount Pendant Installation Instructions
14650 INS-0005_-_Stem_Mount_Pendant_Hang_Straight_Canopy_-_Rev_L.pdf 294531 7 1568751402 Stem Mount Pendant with Hang Straight Canopy
14651 INS-0006_-_Stem_Mount_Pendant_Heavy_Duty_Canopy_-_Rev_C.pdf 281460 7 1568751430 Stem Mount Pendant with Heavy Duty Canopy
9257 SPS-0060_Von_Braun_4-Light_Chandelier_Rev_B.pdf 280939 1 1613582712 Von Braun 4-Light Chandelier