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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4584e48519725c8c69f9ad80b23fc7931c87e8478c6b6b9b56b17e6c2db447' 
  AND token = 'IDIKY18r1fEycZhA8cKWgqoh2AQZ6VkrHGjq+oI0Aoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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