SELECT 
  localization_id, 
  custom_weight_settings, 
  weight_symbol, 
  weight_unit 
FROM 
  cscart_localizations 
WHERE 
  status = 'A'

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "0.35"
    },
    "table": {
      "table_name": "cscart_localizations",
      "access_type": "ALL",
      "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": "792"
      },
      "used_columns": [
        "localization_id",
        "custom_weight_settings",
        "weight_symbol",
        "weight_unit",
        "status"
      ],
      "attached_condition": "(`dev2`.`cscart_localizations`.`status` = 'A')"
    }
  }
}