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, 
  cscart_ab__tag_descriptions.h1, 
  cscart_ab__tag_descriptions.description, 
  cscart_ab__tag_descriptions.page_title, 
  cscart_ab__tag_descriptions.meta_description, 
  cscart_ab__tag_descriptions.meta_keywords, 
  cscart_tags.ab__sft_conditions, 
  cscart_tags.ab__sft_generate_by_cron 
FROM 
  cscart_tags 
  LEFT JOIN cscart_tag_links ON cscart_tag_links.tag_id = cscart_tags.tag_id 
  LEFT JOIN cscart_ab__tag_descriptions ON cscart_tags.tag_id = cscart_ab__tag_descriptions.tag_id 
  AND cscart_ab__tag_descriptions.lang_code = 'ko' 
WHERE 
  1 
  AND cscart_tags.tag_id IN (174241) 
GROUP BY 
  cscart_tags.tag_id 
ORDER BY 
  cscart_tags.tag asc

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "const_condition": "1",
    "table": {
      "table_name": "cscart_tags",
      "access_type": "const",
      "possible_keys": ["PRIMARY", "idx_tag_id"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["tag_id"],
      "ref": ["const"],
      "rows": 1,
      "filtered": 100
    },
    "table": {
      "table_name": "cscart_tag_links",
      "access_type": "ref",
      "possible_keys": ["tag_id", "ids", "idx_tag_id"],
      "key": "ids",
      "key_length": "3",
      "used_key_parts": ["tag_id"],
      "ref": ["const"],
      "rows": 1,
      "filtered": 100,
      "using_index": true
    },
    "table": {
      "table_name": "cscart_ab__tag_descriptions",
      "access_type": "const",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["tag_id", "lang_code"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_ab__tag_descriptions.lang_code = 'ko')"
    }
  }
}