Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a1d46fe457c81829382ec31969eee9fe7067665cf6b713bbddc909be1e9d00' 
  AND token = 'vqX0WHOW2tWlKwySHoQsnbu7PdXl7qRqe2aVELetxzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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