SELECT 
  cscart_tags.tag_id, 
  cscart_tag_links.object_id, 
  cscart_tag_links.object_type, 
  cscart_tags.tag, 
  cscart_tags.status, 
  COUNT(cscart_tag_links.tag_id) as popularity 
FROM 
  cscart_tags 
  LEFT JOIN cscart_tag_links ON cscart_tag_links.tag_id = cscart_tags.tag_id 
WHERE 
  1 
  AND cscart_tag_links.object_type = 'P' 
  AND cscart_tags.status IN ('A') 
  AND cscart_tag_links.object_id = 560448 
GROUP BY 
  cscart_tags.tag_id 
ORDER BY 
  cscart_tags.tag asc

Query time 0.00074

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_tags.tag",
      "temporary_table": {
        "table": {
          "table_name": "cscart_tag_links",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "tag_id", "ids"],
          "key": "PRIMARY",
          "key_length": "6",
          "used_key_parts": ["object_type", "object_id"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "cscart_tag_links.object_type <=> 'P' and cscart_tag_links.object_id <=> 560448 and cscart_tag_links.object_type = 'P'",
          "using_index": true
        },
        "table": {
          "table_name": "cscart_tags",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["tag_id"],
          "ref": ["staging2_wesave_com.cscart_tag_links.tag_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "cscart_tags.`status` = 'A'"
        }
      }
    }
  }
}