SELECT 
  sd.param_id, 
  sd.param, 
  cscart_static_data_descriptions.descr, 
  sd.param_2, 
  sd.param_3, 
  sd.param_4, 
  sd.param_5, 
  sd.param_6, 
  sd.status, 
  sd.position, 
  sd.parent_id, 
  sd.id_path, 
  sd.class 
FROM 
  cscart_static_data AS sd 
  LEFT JOIN cscart_static_data_descriptions ON sd.param_id = cscart_static_data_descriptions.param_id 
  AND cscart_static_data_descriptions.lang_code = 'vi' 
WHERE 
  sd.section = 'A' 
  AND sd.param_5 = '9' 
ORDER BY 
  sd.position

Query time 0.00523

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "sd.position",
            "table": {
              "table_name": "sd",
              "access_type": "ALL",
              "possible_keys": ["section"],
              "rows": 64,
              "filtered": 100,
              "attached_condition": "sd.section = 'A' and sd.param_5 = '9'"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "cscart_static_data_descriptions",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["param_id", "lang_code"],
          "ref": ["dev_db.sd.param_id", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_static_data_descriptions.lang_code = 'vi')"
        }
      }
    ]
  }
}