Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90af2160c1740c7216c5575309ab90327da6486e49802fa93ffad02e72124578' 
  AND token = 'Pi8hQq1Ivx8HWaVRpdLhv2VqCTACTfRlyz4dn2QsdKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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