Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce20ee25b802d399af01d2d887f4b98d9259c669b56967b3f21d0b9832e21ff1' 
  AND token = 'OA2wHINyH4Xtvd952hJ/dLX4zk/v4oJfBvIj4HGETs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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