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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef28fa8e83c2bb131792026598dfcc0bb6c662d3b9db154481f6ea37c3aab5a5' 
  AND token = '69xXsCybs8AT1XqD8v4O7x1SITrLrZ6mTMY9YU0yHY4=' 
  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"
    }
  }
}