Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0c92e72718313660ad68e31cd35ed9223aa185d734205a76a66b96b9723a06' 
  AND token = 'csmr/Tf+XYtJwDF9mqneV5iTtxEIia6VMr42BwzC278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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