Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8620ba44431cfbc026af2c073a2d2136fa76766ed88c12ce483c5b9c18dda13' 
  AND token = '3kcAZyE7Tax7SHq50U/V6mKsI+86jLbM53vVS7VMALM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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