MySQL 5.5, 5.6
MSSQL 2008 R2, 2012
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CREATE INDEX `idx_date_dsr`
USING BTREE ON t_dsref (f_date);
MSSQL example (If you're not just going to use Mangement Studio to make it):
CREATE NONCLUSTERED INDEX idx_date_dsr
ON t_dsref (f_date)
Note: MySQL BTREE indexes have shown positive results on test systems. Other indexes have not been tested. You may want to consult a Database Admin if you're unsure on what to do for your database system.