SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f63ef50078d6f703d5aa4d554134b3c0d9e6bdb2cda300741edf7a69460c8c7' 
  AND token = 'o7i0kF57mMtmsHXVBsf0EyY2lchRlZzrrCs4pMfK+CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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