Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea99dff821ab4e1ff1aacb33d6e905e9c607e8ac3ae940924ca3e11cf0d9e89' 
  AND token = '0su0Cs3FbDdtM2IUL63F2+lHFJrcEMQcx/6PqQXq6uY=' 
  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"
    }
  }
}