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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113296fdede78b50ae9d9726fe7d48adeb12b981c3c295688dc5f0c10ec93443' 
  AND token = 'F/n2elGhEDlBR1NjC4C94GmZxBXDrZiCtbJZZd33m6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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