Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f16cdae9311b366e3537350808ecddd15150c0b7e2cbba78d7732dc33267ad5' 
  AND token = '2SyZ9JsZM9tU3N/fFnaeQhRJQnLJ+WIc5gShrsV8wHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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