Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeba99a21eb5c0570065a85b59966b0659e928c929ff199f68e5a4230b8a871' 
  AND token = 'r8/arvohVItkHYXkzFk2BOnpU9kSxzblbiSNnfhD/Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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