Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c438f6c359281a9212e023422e3868011a26b3a57947aad491f6737a3f488e29' 
  AND token = 't5eDgyHQXETf28gwEcaFb5erjn848UyYWXdHdFpbZxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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