Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778878ad67c036e1307b5ef0f552432b3f53eec5823511987ef62a689b752fb2' 
  AND token = 'MuwsfN0coK+YRizaTHUxe9CxwV06kVGk0kDy7htl8Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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