SELECT 
  a.localization_id, 
  a.status, 
  b.localization, 
  a.is_default 
FROM 
  cscart_localizations AS a 
  LEFT JOIN cscart_localization_descriptions AS b ON a.localization_id = b.localization_id 
  AND b.lang_code = 'ru' 
  LEFT JOIN cscart_localization_elements AS c ON a.localization_id = c.localization_id 
  AND c.element_type = 'L' 
  RIGHT JOIN cscart_languages AS d ON c.element = d.lang_code 
  AND d.status = 'A' 
WHERE 
  a.status = 'A' 
ORDER BY 
  localization

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "3.15"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "1.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "d",
            "access_type": "ALL",
            "possible_keys": [
              "lang_code"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "0.35",
              "data_read_per_join": "216"
            },
            "used_columns": [
              "lang_id",
              "lang_code",
              "status"
            ],
            "attached_condition": "(`dev2`.`d`.`status` = 'A')"
          }
        },
        {
          "table": {
            "table_name": "a",
            "access_type": "ALL",
            "possible_keys": [
              "PRIMARY"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "using_join_buffer": "hash join",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "0.70",
              "data_read_per_join": "792"
            },
            "used_columns": [
              "localization_id",
              "is_default",
              "status"
            ],
            "attached_condition": "(`dev2`.`a`.`status` = 'A')"
          }
        },
        {
          "table": {
            "table_name": "c",
            "access_type": "ref",
            "possible_keys": [
              "c_avail",
              "element"
            ],
            "key": "c_avail",
            "used_key_parts": [
              "localization_id"
            ],
            "key_length": "3",
            "ref": [
              "dev2.a.localization_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.00",
              "eval_cost": "0.10",
              "prefix_cost": "1.80",
              "data_read_per_join": "128"
            },
            "used_columns": [
              "element_id",
              "localization_id",
              "element",
              "element_type"
            ],
            "attached_condition": "((`dev2`.`c`.`element` = `dev2`.`d`.`lang_code`) and (`dev2`.`c`.`element_type` = 'L'))"
          }
        },
        {
          "table": {
            "table_name": "b",
            "access_type": "ref",
            "possible_keys": [
              "localisation_id"
            ],
            "key": "localisation_id",
            "used_key_parts": [
              "localization_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "dev2.a.localization_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "2.15",
              "data_read_per_join": "784"
            },
            "used_columns": [
              "localization_id",
              "localization",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}