Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5b064b364c87954a8df15e915d157527b92e58e4da59d364aa91422909e49b' 
  AND token = '8xq7433SxtRSbwMIgduIOJ8boy4kxkXRKurImWOrPSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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