SELECT 
  `brand_id` 
FROM 
  `cscart_brands` 
WHERE 
  `link` = 'spectehnika'

Query time 0.00113

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "321.10"
    },
    "table": {
      "table_name": "cscart_brands",
      "access_type": "ALL",
      "rows_examined_per_scan": 3181,
      "rows_produced_per_join": 318,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "289.29",
        "eval_cost": "31.81",
        "prefix_cost": "321.10",
        "data_read_per_join": "1M"
      },
      "used_columns": [
        "brand_id",
        "link"
      ],
      "attached_condition": "(`dev2`.`cscart_brands`.`link` = 'spectehnika')"
    }
  }
}