SELECT 
  cscart_cp_blog_categories.category_id, 
  cscart_cp_blog_categories.timestamp, 
  cscart_cp_blog_categories.parent_id, 
  cscart_cp_blog_categories.id_path, 
  cscart_cp_blog_category_descriptions.category, 
  cscart_cp_blog_categories.position, 
  cscart_cp_blog_categories.status, 
  cscart_cp_blog_categories.level, 
  cscart_cp_blog_categories.posts_count 
FROM 
  cscart_cp_blog_categories 
  LEFT JOIN cscart_cp_blog_category_descriptions ON cscart_cp_blog_categories.category_id = cscart_cp_blog_category_descriptions.category_id 
  AND cscart_cp_blog_category_descriptions.lang_code = 'ru' 
WHERE 
  1 
  AND cscart_cp_blog_categories.company_id = 1 
  AND (
    cscart_cp_blog_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_cp_blog_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_cp_blog_categories.usergroup_ids
    )
  ) 
  AND cscart_cp_blog_categories.status IN ('A') 
  AND cscart_cp_blog_categories.category_id IN (3, 4, 5, 6, 7, 2, 0) 
ORDER BY 
  cscart_cp_blog_categories.position asc, 
  cscart_cp_blog_category_descriptions.category asc

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_cp_blog_categories.position, cscart_cp_blog_category_descriptions.category",
      "temporary_table": {
        "table": {
          "table_name": "cscart_cp_blog_categories",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 6,
          "filtered": 100,
          "attached_condition": "cscart_cp_blog_categories.company_id = 1 and (cscart_cp_blog_categories.usergroup_ids = '' or find_in_set(0,cscart_cp_blog_categories.usergroup_ids) or find_in_set(1,cscart_cp_blog_categories.usergroup_ids)) and cscart_cp_blog_categories.`status` = 'A' and cscart_cp_blog_categories.category_id in (3,4,5,6,7,2,0)"
        },
        "table": {
          "table_name": "cscart_cp_blog_category_descriptions",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["category_id", "lang_code"],
          "ref": [
            "noframes_angrybeaver.cscart_cp_blog_categories.category_id",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_cp_blog_category_descriptions.lang_code = 'ru')"
        }
      }
    }
  }
}