SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1552ccf8e9d23d562da55f78dc6ea3e662c2d2f41297426c54167c7b4a20bd01' 
  AND token = 'FMBgcc0UtbeP9HhEEnqUReL/x/wor52wNBYTL+4S8cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

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