Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fe05f68a612a2472e0b40ad792e49527915f9223e1aace33a37ae35d2ff701' 
  AND token = 'bvUG8OKYGJx1vo8NRYsaxbKiVfh953IS246a3IifuEA=' 
  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"
    }
  }
}