Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98c7d5f6ac689170fcd27931f7b3b44b13a61ab017cae0a4683a7f3c7e097a7' 
  AND token = 'hXyPwpVmn6Aha3tdj1AB4kHJLY0HVJtElI7W9V4KIlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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