Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf39bbf5979962e00ac201660be62b72708e4f9d198fa999d05fe957b7e7cfd' 
  AND token = 'SW+kyF7MMzBbNFTFtKFlMEO275Y4Ef9n66iq7fXic2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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