Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c894b0c776e77045149616c009e82f08bf97b77ab394816825bc6c632e7ea5' 
  AND token = 'YFdl4OfuktgBu/nXqlT4J8+PDm1t+/YtmTw0DP6fpAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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