Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bf4d572a61311ac0f64d4f2685a49e75c819fca8f3b225f9b844350148f33f' 
  AND token = 'DDSPXk7oM63CPo+T2EeGbFOs+Ya34KICW6mgUMqNn+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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