Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9b21a2623c37fd934e277c5579b2363e347ceda578c78e7f1be6096f1d7599' 
  AND token = 'o2+OZTtsfYnad4aY8J2dFy5nRUecV0VsBXx1kYdC2ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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