sql - Optimizing a MySQL Join Query? -

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i have following query:

select *   products p  left join files f on f.contentid = p.productid          p.state = 'active' ,       p.price > 0 order p.created desc     limit 2200

currently, query takes 1.7 seconds 2200 rows. don't understand is, why time not decrease when change limit 2200 10, , more importantly, can speed up?

try :

explain select *   products p  left join files f on f.contentid = p.productid          p.state = 'active' ,       p.price > 0 order p.created desc     limit 2200

to see indexes need


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