Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd72142749bc6922b0777faabd597fdce238941ca8daa4c91d8b5bc36b65669' 
  AND token = '2ybK5tk1Xa+ZQRp5ZTFUQgLmjfRunATq6qw8NkPWO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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