Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8f845c5b11ef430c5c28d5b8276c3d178d0ac52b9d9bb02d51c0187eedcb93' 
  AND token = 'jTPgp9R7okhmjr6p7wVWFaPA7dzTVqPQHCh36AsZvcs=' 
  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"
    }
  }
}