SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fef15f71548615997d3b5d77a310e255e901397fcd4c11873ba30b92934a35b' 
  AND token = 'WqsHqeAnYYUohOWSSwJeT03XcmUnpPrYh+mRJfbbKXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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