SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2520001fac6c57c408fcc4b367f9cae48f03971487ea545ae42256fe316ce3c5' 
  AND token = 'Qc/KlkdgmSX0b3OvAUBs5G1OrjxbD+GZi18gV2s6OGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

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