Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2b8cc5272e4adb7dede34ec56589d70e990308a0ee25f02bc874415b07d9fc' 
  AND token = 'jBIzxIZKjp9ZTTezjq2THmkxAv4HiS66MI/d2uALeZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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