sql - Mysql: How to optimize this query. for faster results -

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how optimize query, faster result tooks 80+ seconds on 10 million rows.

su_id , admin_id both btree indexed

select su_id members_ext admin_id = 5962789

both int data types, btree index

cardinality of su_id 8496470 , admin_id 10437

explain result 

id  ,select_type,table  ,type,rows,    1, simple ,members_ext , ,8496471 ,using

make combined key on admin_id, su_id, data can fetched index only.


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