Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d937b8e675bea14241d5acd553ad7912d82d988d2b2298e6bcff1f43eb1c33b' 
  AND token = 'IsSpVaM52lqjC2CTbTVGwX0V8gSFXRu4EsMLTQSjfn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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