SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881226506efafdf4dd7d5b3a3bedd00eca35fad1cba2d854347ae7557d4ef999' 
  AND token = 'ub3aEHjPgQJGT/L2JkEyZXfoBTeCei2RWRBlLMbOqOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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