Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d55bb563a3b37032fce100f5141cba976e6808cf85fd8db3d642d3916115fad' 
  AND token = 'IbQRoWyzt8QLxVIqtRWfwZLx+PCMa3SwFzwDQkfwXqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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