SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55588509d2208db233bffb88863bcc4d099afe14c70c3a75921bb1bf5e84a020' 
  AND token = 'EEEMEEGGzJz/nFKZOIOh51JhvIyg+KTVG6MHiEZYIZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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