Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3f0fe203703baae5b2c3915dfb2e424bd0a26a99ece392b0f7f9e4c3b48403' 
  AND token = 'A8sIVsg3vjAFABBxekLavd5lAni/0PJfBV+rkQkAdYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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