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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9b699dda9f8a92b0ee674dfde315582d248b761399733d79831b1b35c6804d' 
  AND token = 'I9+l/bYUf5NOhWqaDPa0OitUk+C+UOnRniGhx12W9KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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