Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42acdbcfccb537ebecdd745b2e21b248dd3623c9c45b43d7c10eed6c99375184' 
  AND token = 'nH4u2HhzVSpy8/5wXaGGIcvki2Ae6Yssr/95qcF+bH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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