Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3374972e13b62c7b6a75ea16a15f2b95908bad611ca3cb6a6dab0cd3a11a60a9' 
  AND token = '7HPdsHSfBY/lZObmERVxtMQtyXsb7HrzjBUThjnx1MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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