SELECT 
  addon, 
  priority, 
  status, 
  unmanaged 
FROM 
  cscart_addons 
WHERE 
  1 
ORDER BY 
  priority

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_addons.priority",
        "table": {
          "table_name": "cscart_addons",
          "access_type": "ALL",
          "rows": 81,
          "filtered": 100
        }
      }
    }
  }
}