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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399632c8e53168e5250d4b23ea6e916e4247752825ab9a745ad83f72c078d83c' 
  AND token = 'raAsKKoC+xYJ/F7yOf6MaKfY6cYd+V09I6PRgFYHR8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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