Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfa50daa89a470d1e65b4684478c8564c9835459a2f535f62ac0bbf97124afc' 
  AND token = 'LZ7DQrwdnfrtmYtVRtxs+Un8JoY8LraNX+jLdzo/L7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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