SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989093b107381138ea44a1de39e322aeaaa7a79580ad4c8f6016829b4b555e46' 
  AND token = 'KMJF57n7niUMOdRS3Ztj0HM/GFeOx3Uh5CpDUvtzjNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

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