Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ea3da2afd6b5d4c159074323c30fd3d8f0fe47402410e7a4566dc70986bb0c' 
  AND token = '1dg+BKtL0LsRnydrV7aJoCuAde/A64kjASpnsVC6nsg=' 
  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"
    }
  }
}