Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ed056de25d297ab707d29ee9e6cb76a57625134d9c1ba07787516a68bd3d48' 
  AND token = 'aSBnt941CNV63xWDVH9AhiupF9flO7vOK83mHusjyuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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