Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4f72911b164ab376676bbff2c9b33ecdfc1477ee25c7bf48740e7a02387b3e' 
  AND token = 'kx8Tb/IOqnBDReIq+lDgXETOsgdOT2qg0ggyspyfOrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}