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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44859aa5f8b0927e311a168e3d4053bfdeaa0836cbb07978865f921e2e4aba7a' 
  AND token = 'CGYDzZzrW7q5nshg4VbzK1IyeQrUDYcIQ1eV/Jgyk7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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