SELECT 
  a.code, 
  b.country 
FROM 
  cscart_multi_deccountries as a 
  LEFT JOIN cscart_multi_deccountry_descriptions as b ON b.code = a.code 
  AND b.lang_code = 'ru' 
WHERE 
  1 
  AND a.status = 'A' 
ORDER BY 
  b.country

Query time 0.00257

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "590.73"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "244.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "a",
            "access_type": "ALL",
            "possible_keys": [
              "status"
            ],
            "rows_examined_per_scan": 247,
            "rows_produced_per_join": 243,
            "filtered": "98.79",
            "cost_info": {
              "read_cost": "5.13",
              "eval_cost": "48.80",
              "prefix_cost": "53.93",
              "data_read_per_join": "11K"
            },
            "used_columns": [
              "code",
              "status"
            ],
            "attached_condition": "(`vishalecarter_multi_dec`.`a`.`status` = 'A')"
          }
        },
        {
          "table": {
            "table_name": "b",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "code",
              "lang_code"
            ],
            "key_length": "12",
            "ref": [
              "vishalecarter_multi_dec.a.code",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 243,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "244.00",
              "eval_cost": "48.80",
              "prefix_cost": "346.73",
              "data_read_per_join": "95K"
            },
            "used_columns": [
              "code",
              "lang_code",
              "country"
            ]
          }
        }
      ]
    }
  }
}