Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abd01408b5995eebd30f3d5078aa9832a0abf4f2d5e2a3d5674cc3df7e04fa3' 
  AND token = 'MpsBCsbJfUWOmqmYg2uuKGrk8KmJL5JeH8ItMTrpDU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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