mysql - Evaluating database() in a query -

how can use database() within query? here's example i'm trying do:

select database();

returns "my_table"

select * information_schema.statistics  table_schema = database() ,  table_name = 'my_table' , index_name = 'my_index' limit 1;

doesn't work

select * information_schema.statistics  table_schema = (select database()) ,  table_name = 'my_table' , index_name = 'my_index' limit 1;

doesn't work

select * information_schema.statistics  table_schema = 'my_table' ,  table_name = 'my_table' , index_name = 'my_index' limit 1;

works charm

so question is, how can evaluate database() within query make query dynamic? need query check if index exists scripts knows if needs add or not.

Live