How to use datatable with a complex query?

I have the following query which I converted into a MySQL View, however, when using the View in datatables and passing some where filters, it takes forever for a query to run. When the following query is run on its own it runs very fast.

My question then is, how can I use the following query in server side processing with datatables? Any help would be much appreciated.

    SELECT 
        od.id AS id,
        od.userid AS orderuserid,
        cu.id AS customerid,
        us.id AS userid,
        concat(us.firstname, ' ', us.lastname) AS username,
        cu.customername AS customername,
        od.productid AS productid,
        od.ordernumber AS ordernumber,
        sum(od.quantity) AS qty_sum,
        od.orderdate AS orderdate,
        count(od.ordernumber) AS sub_sum
    FROM
        ((table_orderdetails od
        join table_customers cu)
        join table_users us)
    WHERE
        (od.userid = us.id) and cu.id = { variable to be passed}
        and date(orderdate) = '{variable to be passed}'
    GROUP BY cu.customername , od.orderdate , od.userid , od.productid , od.quantity , us.username , od.productid , od.ordernumber
    ORDER BY cu.customername , od.orderdate , od.userid , od.productid , od.quantity