Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1689075cf9237a3880e31a4cae02ddcf6d54caefe1f592531ca89271b0c0d9bb' 
  AND token = 'ErH4xw4Af6KEhfjYtV5wjdpgiOr68Y36BbeFk66xVow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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