Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc02f68da9483e5e933521b31d550045b6def6f5a858f8c19473a63f32bed844' 
  AND token = 'z0S2Ay6l8WCyVyfqujyOv1XW6Znxp9pMVbNG4hn+Zso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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