SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0e8166ce3d3358dddbde1092ef76cc4920e90ebbb8ec87b99221f84534a5d7' 
  AND token = 'Uif+Uk0DeMdimJKQhFPPj0FwGjnQubuVCBQvQs+4c8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables