Du kan göra en inner join
av produkt- och statustabell med FK product_id
och filtrera bort order_status_id
i where-satsen.
Delete t
from TablenName t join
(select op.product_id, sum(op.quantity) as quantity
from oc_order_product op
inner join oc_order_status os on os.product_id =op.product_id
where os.order_status_id IN (3,5,17,19,20,23,25,26,29)
group by op.product_id
) op
on op.product_id = t.product_id and op.quantity < 2;