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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2349b7805c36e0f16b1d25ecba77b075f64cb8c313db7d7b4fb7ffaa7758462b' 
  AND token = 'iXoLMaZU6LM9R+M0iR1rx/nvqOO2ShYc8XWxZh2mTqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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